AG-2114 React Components are rendered to the root of the DOM tree

AG-2417 Issue with React 6: withRef is removed. To access the wrapped instance, use a ref on the connected component
AG-2439 Add support for react-redux v6

h/t @hrgui - thanks!

src-examples/simpleReduxDynamicComponentExample/GridComponent.jsx

@@ -1,12 +1,9 @@
 import React, {Component} from "react";
-import * as PropTypes from "prop-types";
-
-import {AgGridReact} from "ag-grid-react";
 import {connect} from "react-redux";
 
-import PriceRenderer from "./PriceRenderer";
+import {AgGridReact} from "ag-grid-react";
 
-const ThemeContext = React.createContext('light');
+import PriceRenderer from "./PriceRenderer";
 
 /*
  * This component serves to display the row data (provided by redux)
@@ -49,7 +46,6 @@ class GridComponent extends Component {
                     rowData={this.props.rowData}
 
                     reactNext={true}
-                    reduxStore={this.context.store} // must be supplied when using redux with reactNext
 
                     // events
                     onGridReady={this.onGridReady}>
@@ -59,10 +55,6 @@ class GridComponent extends Component {
     }
 }
 
-GridComponent.contextTypes = {
-    store: PropTypes.object                         // must be supplied when using redux with reactNext
-};
-
 // pull off row data changes
 export default connect(
     (state) => {

src-examples/simpleReduxDynamicComponentExample/PriceRenderer.jsx

@@ -21,7 +21,8 @@ class PriceRenderer extends Component {
     render() {
         return (
             <FontContext.Consumer>
-                {fontWeight => <span style={{fontWeight}}> {this.props.currencySymbol}{this.state.convertedValue}</span> }
+                {fontWeight => <span
+                    style={{fontWeight}}> {this.props.currencySymbol}{this.state.convertedValue}</span>}
             </FontContext.Consumer>
         );
     }
@@ -40,5 +41,5 @@ export default connect(
     },
     null,
     null,
-    {withRef: true} // must be supplied for react/redux when using GridOptions.reactNext
+    {forwardRef: true} // must be supplied for react/redux when using GridOptions.reactNext
 )(PriceRenderer);